PHYSICS
posted by Anonymous .
A stone propelled from a catapult with a speed of 50m/s attains a height of 100m.Calculate:(a)the time of flight?

PHYSICS 
Damon
Just as long as anything else that goes up 100 meters and falls
Which is twice as long as it takes to fall 100 meters
h = (1/2) g t^2
100 = 4.9 t^2
t = 4.52 seconds to fall
so about 9 seconds
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